Small Mammals from Sankuru, South Congo, 239 
Skull—Nasals comparatively short and broad, less nar- 
rowing backwards than usual. Anteorbital plate short, little 
projected forwards. Interorbital region not so elongate and 
paiallel-sided as in M. longipes, its edges sharply squared 
and forming ridges evenly divergent backwards, In J. /on- 
gipes the greater part of the supraorbital margin is smoothly 
rounded, the inconspicuous ridges only commencing posterior 
to the olfactory-cerebral constriction. 
Dimensions of the type (measured in flesh) :— 
Head and body 151 mm.; tail 180; hind foot 38 ; 
ear 27. 
Skull: back of parietals to tip of nasals 35°35 ; zygomatic 
breadth 17; nasals 16°2x4°8; interorbital breadth 6°8; 
palatilar length 18°2; palatal foramina 6; upper molar 
series 5°7. 
This new species of the interesting genus Malacomys is 
distinguished by its contrasted grey and blackish tace- 
markings and the structure of the interorbital region of its 
skull. I have much pleasure in naming it after Mr. Wilson, 
to whom we are indebted for the collection of which it forms 
a part. 
Now that I have seen how much the skulls of Alalacomys 
may differ in size in the same locality, I have considerable 
doubt as to the specitic validity of J/. centralis, de Wint., 
which was distinguished mainly on size. The skull used as 
representative of J/. longipes by Mr. Ge Winton was un- 
usually small, and has since been supplemented by others 
from the same region quite as large as average M. centralis. 
15. Qnomys hypoxanthus, Puch. 
dg. 19. Inkongo. 
16. Lemniscomys striatus, L. 
dg. 1,5, 6, 14,22; 9.3,4,12. Inkongo. 
“* Tubasha.’ Common on open grass-land.”—//. IV. 
17. LHybomys univittatus, Pet. 
6. 23. Inkongo. 
«Trapped in wood.”"—H. W. 
18. Thamnomys rutilans, Pet. 
9.16. Inkongo. 
* Killed in clearing at edge of forest.”—H. W. 
~19. Grammomys surdaster, Thos. & Wr. 
$ (young). 13; 2. 29. Inkongo. 
«‘ Trapped on site of old clearing.’”—/7. W. 
